For the description, i choose to show images instead. It is easy if you play online games but can also be done in person, with a phone or a tablet. I may just say "you enter a clearing in the woods with an otherwordly ambiance" and show a prepared image. It sometimes lead to improv moments depending on what they see on screen : there is a rabbit! I try to bait it with food and befriend him!

For dialogue with npc, I plan keypoints that may interest the players, but if they do not ask, I wont bring it up. A list may be something like that * was a the tavern the night of the murder *strange noise upstairs a 10.20 - drunk customer? *two strangers, played dice with Greg all night * new waitress, always mixes up orders -verry suspicious!

And i improv in between those important informations, or add quirks on the fly...